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Been bleeding a mates set of hayes sole brakes and for the life of me i cannot get the rear to bite properly. Bled as per instructions, changed pads, cleaned disk thoroughly etc etc and it still is not biting properly.
Any suggestions would be gratefully received
i had some of those disks on my first bike and they were so awful, that the best advice is to pick up some better brakes on e-bay or here and throw the So1e's away.
failing that:
on each side of the calliprs in the middle is a hole for the allen key, you will need to make sure that these are altered to remain central, it might be that the fixed pad side is too far out and is not reaching the disk to make the other side bite.
also have you checked the actual reseviour on the lever - there is a tiny plug (that fell out on mine)and it needs to be in to create a seal in the line - it might be that this is not in properly and you are losing pressure so the pads don't move
i think that are the major pitfalls - it has been a number of years since i had these brakes
PFP has just reminded me about that theres a stupid lock grub screw on the fixed side...
my m8's never work particulary well from new, after a couple of years and one popping all the fluid on a long decent I swapped them out and he gave me the old ones....
it wasn't till I stripped them and found there a grub screw had been locking the fixed piston in place, by coming out behind it, instead of up against the piston as it should be set & so we had very little adjustment via the external allen key... so much for bike shops knowing best. Not sure this is the source of your issue, but worth investigating, to get them working right.